The Indian Air Force, on Tuesday, phased out one more Mig-21 fighter squadron, No. 4 Mig-21 squadron based at Uttarlai and re-equipping it with SU-30MKIs, leaving two squadrons of the legacy jets in service. “The squadron known as ‘OORIALS’ has been operating the MiG-21 since 1966 and is now being re-equipped with the Sukhoi-30 MKI aircraft,” said Colonel Amitabh Sharma, …